OEM Carrier Furnace Transformer 40VA 120V–24V for Model PG9MTAV60125ABSS

This OEM control circuit transformer is the factory-specified replacement for the Carrier PG9MTAV60125ABSS gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat circuit, control board, gas valve, and all low-voltage safety controls. When this part fails, the entire furnace control circuit goes dead — the thermostat goes blank, the inducer never starts, and the system will not respond to any heat call. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing more expensive components.

• Specs: 120V primary | 24V secondary | 40VA rated | Part No. HT01BC117 (superseded by HT680056) | Cross-references: BE161840GDD, 1172810
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Undersized or off-tolerance generic transformers can cause nuisance lockouts, erratic thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm voltage is zero before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Reconnect wires to matching terminals and restore power to verify 24V output across secondary leads.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Directly fits Carrier PG9MTAV60125ABSS and related PG9MTAV series gas furnaces. Also fits select 58HDV, 58HDX, 359AAV, 359BAV, PG9YAA, and PG9YAB series models. Always verify the part number on your existing transformer's label before ordering. Our fitment team is available to confirm compatibility before you buy — no return hassle.